source/stereoview.cpp

   1 #include <msp/gl/renderer.h>
   2 #include "stereocombiner.h"
   3 #include "stereoview.h"
   4
   5 using namespace std;
   6
   7 namespace Msp {
   8 namespace VR {
   9
  10 StereoView::StereoView(unsigned w, unsigned h, const GL::Camera &c, const GL::Renderable &r, const StereoCombiner &m):
  11         width(w),
  12         height(h),
  13         base_camera(c),
  14         renderable(r),
  15         combiner(0)
  16 {
  17         set_combiner(m);
  18         set_eye_spacing(0.07);
  19 }
  20
  21 void StereoView::set_combiner(const StereoCombiner &c)
  22 {
  23         combiner = &c;
  24
  25         unsigned w = width/combiner->get_width_divisor()*combiner->get_oversize();
  26         unsigned h = height/combiner->get_height_divisor()*combiner->get_oversize();
  27         left.create_target(w, h);
  28         right.create_target(w, h);
  29 }
  30
  31 void StereoView::set_eye_spacing(float s)
  32 {
  33         eye_spacing = s;
  34 }
  35
  36 void StereoView::setup_frame() const
  37 {
  38         offset_axis = normalize(cross(base_camera.get_look_direction(), base_camera.get_up_direction()))*0.5f;
  39
  40         EyeParams params;
  41         params.fov = combiner->get_field_of_view();
  42         if(params.fov==Geometry::Angle<float>::zero())
  43                 params.fov = base_camera.get_field_of_view();
  44
  45         params.aspect = base_camera.get_aspect();
  46         if(!combiner->is_aspect_kept())
  47                 params.aspect = params.aspect*combiner->get_height_divisor()/combiner->get_width_divisor();
  48
  49         params.near_clip = base_camera.get_near_clip();
  50         params.far_clip = base_camera.get_far_clip();
  51
  52         float frustum_skew = combiner->get_frustum_skew();
  53
  54         left.setup_frame(base_camera, offset_axis*-eye_spacing, frustum_skew, params);
  55         right.setup_frame(base_camera, offset_axis*eye_spacing, -frustum_skew, params);
  56
  57         renderable.setup_frame();
  58 }
  59
  60 void StereoView::finish_frame() const
  61 {
  62         renderable.finish_frame();
  63 }
  64
  65 void StereoView::render(const GL::Tag &tag) const
  66 {
  67         setup_frame();
  68         left.render(renderable, tag);
  69         right.render(renderable, tag);
  70         combiner->render(left.target->color, right.target->color);
  71         finish_frame();
  72 }
  73
  74 void StereoView::render(GL::Renderer &renderer, const GL::Tag &tag) const
  75 {
  76         renderer.escape();
  77         return render(tag);
  78 }
  79
  80
  81 StereoView::RenderTarget::RenderTarget(unsigned width, unsigned height)
  82 {
  83         color.set_min_filter(GL::LINEAR);
  84         color.set_wrap(GL::CLAMP_TO_EDGE);
  85         color.storage(GL::RGB, width, height);
  86         fbo.attach(GL::COLOR_ATTACHMENT0, color);
  87
  88         depth.storage(GL::DEPTH_COMPONENT, width, height);
  89         fbo.attach(GL::DEPTH_ATTACHMENT, depth);
  90 }
  91
  92
  93 StereoView::Eye::Eye():
  94         target(0)
  95 { }
  96
  97 void StereoView::Eye::create_target(unsigned w, unsigned h)
  98 {
  99         delete target;
 100         target = new RenderTarget(w, h);
 101 }
 102
 103 void StereoView::Eye::setup_frame(const GL::Camera &base_camera, const GL::Vector3 &offset, float frustum_skew, const EyeParams &params) const
 104 {
 105         camera.set_position(base_camera.get_position()+offset);
 106         camera.set_up_direction(base_camera.get_up_direction());
 107         camera.set_look_direction(base_camera.get_look_direction());
 108
 109         camera.set_field_of_view(params.fov);
 110         camera.set_aspect(params.aspect);
 111         camera.set_depth_clip(params.near_clip, params.far_clip);
 112         camera.set_frustum_axis(frustum_skew, 0);
 113 }
 114
 115 void StereoView::Eye::render(const GL::Renderable &renderable, const GL::Tag &tag) const
 116 {
 117         GL::Bind bind_fbo(target->fbo);
 118         target->fbo.clear(GL::COLOR_BUFFER_BIT|GL::DEPTH_BUFFER_BIT);
 119         GL::Renderer renderer(&camera);
 120         renderable.render(renderer, tag);
 121 }
 122
 123 } // namespace VR
 124 } // namespace Msp